Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f50e89875a5de3f…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 15:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb6264e2b12ca3db4b518da345d5e689 SHA-1: f594867b8db63ad4b4daf75edbeeab6eb9037c91 SHA-256: 4f50e89875a5de3f57e574a55038c4d7e2612eaf7397b83f2ac26784dbcfebdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae8aa21e7---gejafonojepesil.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf808507b---rigifegunelo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sexedowiropizululimeso.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c061b725f---59272990614.pdfIn PDF document text
    • http://billsky.ee/files/file/vijofakesefib.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jcssa2p17s8i2lj4lv5a1tau55/kimulitevigaxuvi.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jutojogovijokideropom.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/45697659149.pdfIn PDF document text
    • http://silver1979.com/upload/file/86977187231.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/72634824296.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062015024273499.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/88059638738.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dab6f0790381748a4ca6eb982835d8d2/nerewepodosobumonovem.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/82278b6b26871db049d16ded282b5f4c/42127014723.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/30953433248.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e609011fe5---85137620078.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dojorixukefetebuxam.pdfIn PDF document text
    • https://dineflon.com//files/fenemoxumo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c22cadf7e8fb24a2b08e3fb7754792cc/62576238686.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/mujozurekowefis.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/duwedujonevixipuxupu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb921a55b6---sititebeto.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12550500221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tanglewood+case+studyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 18576 bytes
SHA-256: 445cc5180522cb988a0f8564f775bbb0f27dac75f29acfd9bf81fca588aaa5e2
font_01_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 10616 bytes
SHA-256: 670360ebd5d5733c2304d59989eed32491d3067c975bf142b5f9d2cf9505217d